Hi,
i am currently implementing some basic structural icing.
It is implemented in nasal and works like this:
- check outside air temperature, dewpoint and effective visibility in a timer
loop at low frequency
- if temperature is in the potential icing range and equal to dewpoint and
visibility below a certain value, assume you are in cloud and propagate a
generated icing severity (trace,light,moderate,severe) to the property tree.
Since there is no information about the liquid water content of our generic
clouds, I use an algo to generate the severity of icing.
- Another part checks the icing severity and calculates the icing level on
configurable icing sensitive areas (wing, prop, fuselage etc). These icing
levels can than be used to scale some lift and drag coefficients and change
the mass of the aircraft in the FDM and let your bird do some unexpected
things. They can also be used for 3d model animations to make the ice
visible.
The prototype is already working on my local copy. Only one tiny change to the
core fg source is required. Since there is no property to get the current
visibility, I have attached a patch to environment_mgr.cxx that ties the
FGSky::visibility to a property /envirionment/effective_visibility-m.
Can one of the cvs masters apply this patch?
I will publish the icing code after some more testing.
Freezing Greetings
Torsten
Index: environment_mgr.cxx
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/Environment/environment_mgr.cxx,v
retrieving revision 1.22
diff -u -p -r1.22 environment_mgr.cxx
--- environment_mgr.cxx 23 Mar 2006 16:48:45 -0000 1.22
+++ environment_mgr.cxx 22 May 2006 14:08:16 -0000
@@ -86,6 +86,8 @@ FGEnvironmentMgr::bind ()
fgTie("/environment/visibility-m", _environment,
&FGEnvironment::get_visibility_m, &FGEnvironment::set_visibility_m);
fgSetArchivable("/environment/visibility-m");
+ fgTie("/environment/effective_visibility-m", thesky,
+ &SGSky::get_visibility );
fgTie("/environment/temperature-sea-level-degc", _environment,
&FGEnvironment::get_temperature_sea_level_degc,
&FGEnvironment::set_temperature_sea_level_degc);
@@ -196,6 +198,7 @@ void
FGEnvironmentMgr::unbind ()
{
fgUntie("/environment/visibility-m");
+ fgUntie("/environment/effective_visibility-m");
fgUntie("/environment/temperature-sea-level-degc");
fgUntie("/environment/temperature-degc");
fgUntie("/environment/dewpoint-sea-level-degc");
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